Right way to write JSON deserializer in Spring or extend it

I've searched a lot and the best way I've found so far is on this article:

Class to serialize

package net.sghill.example;import net.sghill.example.UserDeserializerimport net.sghill.example.UserSerializerimport org.codehaus.jackson.map.annotate.JsonDeserialize;import org.codehaus.jackson.map.annotate.JsonSerialize;@JsonDeserialize(using = UserDeserializer.class)public class User {    private ObjectId id;    private String   username;    private String   password;    public User(ObjectId id, String username, String password) {        this.id = id;        this.username = username;        this.password = password;    }    public ObjectId getId()       { return id; }    public String   getUsername() { return username; }    public String   getPassword() { return password; }}

Deserializer class

package net.sghill.example;import net.sghill.example.User;import org.codehaus.jackson.JsonNode;import org.codehaus.jackson.JsonParser;import org.codehaus.jackson.ObjectCodec;import org.codehaus.jackson.map.DeserializationContext;import org.codehaus.jackson.map.JsonDeserializer;import java.io.IOException;public class UserDeserializer extends JsonDeserializer<User> {    @Override    public User deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {        ObjectCodec oc = jsonParser.getCodec();        JsonNode node = oc.readTree(jsonParser);        return new User(null, node.get("username").getTextValue(), node.get("password").getTextValue());    }}

Edit:Alternatively you can look at this article which uses new versions of com.fasterxml.jackson.databind.JsonDeserializer.

I was trying to @Autowire a Spring-managed service into my Deserializer. Somebody tipped me off to Jackson using the new operator when invoking the serializers/deserializers. This meant no auto-wiring of Jackson's instance of my Deserializer. Here's how I was able to @Autowire my service class into my Deserializer:

context.xml

<mvc:annotation-driven>  <mvc:message-converters>    <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">      <property name="objectMapper" ref="objectMapper" />    </bean>  </mvc:message-converters></mvc><bean id="objectMapper" class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean">    <!-- Add deserializers that require autowiring -->    <property name="deserializersByType">        <map key-type="java.lang.Class">            <entry key="com.acme.Anchor">                <bean class="com.acme.AnchorDeserializer" />            </entry>        </map>    </property></bean>

Now that my Deserializer is a Spring-managed bean, auto-wiring works!

AnchorDeserializer.java

public class AnchorDeserializer extends JsonDeserializer<Anchor> {    @Autowired    private AnchorService anchorService;    public Anchor deserialize(JsonParser parser, DeserializationContext context)             throws IOException, JsonProcessingException {        // Do stuff    }}

AnchorService.java

@Servicepublic class AnchorService {}

Update: While my original answer worked for me back when I wrote this, @xi.lin's response is exactly what is needed. Nice find!

With Spring MVC 4.2.1.RELEASE, you need to use the new Jackson2 dependencies as below for the Deserializer to work.

Dont use this

<dependency>              <groupId>org.codehaus.jackson</groupId>              <artifactId>jackson-mapper-asl</artifactId>              <version>1.9.12</version>          </dependency>  

Use this instead.

<dependency>            <groupId>com.fasterxml.jackson.core</groupId>            <artifactId>jackson-annotations</artifactId>            <version>2.2.2</version>        </dependency>        <dependency>            <groupId>com.fasterxml.jackson.core</groupId>            <artifactId>jackson-core</artifactId>            <version>2.2.2</version>        </dependency>        <dependency>            <groupId>com.fasterxml.jackson.core</groupId>            <artifactId>jackson-databind</artifactId>            <version>2.2.2</version>        </dependency>  

Also use com.fasterxml.jackson.databind.JsonDeserializer and com.fasterxml.jackson.databind.annotation.JsonDeserialize for the deserialization and not the classes from org.codehaus.jackson